Ruthenium alloy



Patented Get. 1, 1929 .itil liifi STATES 1 meta PTENT are MELVEN 1Y1. GOLDSMITH AND WILLIAM H. FALCK, OF CHICAGO, ILLINOIS; SAID FALCK ASSIGNOR TO' GOLDSMITH BROS. SMELTING & REEINING COMPANY, A CORPORA- TIO1\T- OF WEST VIRGINIA No Drawing.

This invention rclatesto the manufacture of alloys of ruthenium as a suliistitute for the native osmiridium.

. The main object is to produce a ruthenium alloy having Wearing qualities substantially. equivalent to those of the native osmiridium. Other objects of the invention are'to provide such an alloy which is easily fusible with gold; to provide such an alloy with a crystalline structure so that it can be crushed into small pellets such as are required forpen points; and to provide an alloy that will not metals of the platinum group, such as osmium,-

platinum, rhodium, iridium or palladium,

but, in Which alloys the amount of ruthenium shall be in excess of any other metal of the platinum group.

Application filed January 3,

RUTHENIUM ALLOY 1927. Serial No. 158,817.

iridium or platinum are added. Successful alloys have been prepared by using ruthenium osmium 25%, tantalum 25%, or, ruthenium 41%, osmium 40%, platinum 4 rhodium 1 tungsten 10% and nickel 3%.; f i

When the ruthenium alloy contains a member of the platinumgroup as given in the above illustrative alloys, the resultant alloy is harder, has'better color, and takes a better polish than those ruthenium alloys in which only the non-precious metals are used.

- This application isa continuation'in part of our copending application Serial No.

58,081, filed September 23,1925, and contains matter derived therefrom.

We claim:'- 1. As a substitute for osmiridium, an alloy comprising ruthenium about 75%, tungsten about 17 and nickel about 7 2. As a substitute for osmiridium, analloy comprising ruthenium to 35% and a complement consisting'of tungsten 17% to a 35%, and nickel 7 to30% respectively,

Signed at Chicagothis 14th day of December, 1926.

MELVIN M. GOLDSMITH. WILLIAM H. FALCK.

The alloys are produced by melting the constituents under such conditions as will insure complete fusion and a perfectly umform alloy, at the same time using extreme care to avoid contaminations from the refractory and from oxidation.

Illustrative alloys having ical characteristics in which ruthenium is the only metal of the platinum group present are successfully prepared by using ruthenium 75%, tungsten 17 and nickel 7 or, ruthenium 35%, tungsten 35% and nickel 30%. A fairly satisfactory alloy isalso prer pared by using ruthenium 15%, tungsten 40%, nickel 32 tantalum 10% and molybdenum 2 I And an illustrative ruthenium alloy of greater hardness is obtained when a small portion of osmium, palladium, rhodium,

the desired phys-i 

